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Demirkiran O, Almaliti J, Leão T, Navarro G, Byrum T, Valeriote FA, Gerwick L, Gerwick WH. Portobelamides A and B and Caciqueamide, Cytotoxic Peptidic Natural Products from a Caldora sp. Marine Cyanobacterium. J Nat Prod 2021; 84:2081-2093. [PMID: 34269583 DOI: 10.1021/acs.jnatprod.0c01383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Three new compounds, portobelamides A and B (1 and 2), 3-amino-2-methyl-7-octynoic acid (AMOYA) and hydroxyisovaleric acid (Hiva) containing cyclic depsipeptides, and one long chain lipopeptide caciqueamide (3), were isolated from a field-collection of a Caldora sp. marine cyanobacterium obtained from Panama as part of the Panama International Cooperative Biodiversity Group Program. Their planar structures were elucidated through analysis of 2D NMR and MS data, especially high resolution (HR) MS2/MS3 fragmentation methods. The absolute configurations of compounds 1 and 2 were deduced by traditional hydrolysis, derivative formation, and chromatographic analyses compared with standards. Portobelamide A (1) showed good cytotoxicity against H-460 human lung cancer cells (33% survival at 0.9 μM).
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Affiliation(s)
- Ozlem Demirkiran
- Department of Pharmacognosy, Faculty of Pharmacy, Trakya University, Edirne 22030, Turkey
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, United States
| | - Jehad Almaliti
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, United States
| | - Tiago Leão
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, United States
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, United States
| | - Gabriel Navarro
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, United States
| | - Tara Byrum
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, United States
| | - Frederick A Valeriote
- Henry Ford Health System, Department of Internal Medicine, Josephine Ford Cancer Center, Detroit, Michigan 48202, United States
| | - Lena Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, United States
| | - William H Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, United States
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, United States
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2
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Caro-Diaz EJE, Valeriote FA, Gerwick WH. Correction to “Highly Convergent Total Synthesis and Assignment of Absolute Configuration of Majusculamide D, a Potent and Selective Cytotoxic Metabolite from Moorea sp.”. Org Lett 2020; 22:6220. [DOI: 10.1021/acs.orglett.0c02252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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Dhanju S, Upadhyaya K, Rice CA, Pegan SD, Media J, Valeriote FA, Crich D. Synthesis, Cytotoxicity, and Genotoxicity of 10-Aza-9-oxakalkitoxin, an N,N,O-Trisubstituted Hydroxylamine Analog, or Hydroxalog, of a Marine Natural Product. J Am Chem Soc 2020; 142:9147-9151. [DOI: 10.1021/jacs.0c03763] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sandeep Dhanju
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Kapil Upadhyaya
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States
| | - Christopher A. Rice
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States
| | - Scott D. Pegan
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States
| | - Joseph Media
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Cancer Institute, Detroit, Michigan 48202, United States
| | - Frederick A. Valeriote
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Cancer Institute, Detroit, Michigan 48202, United States
| | - David Crich
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, United States,
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, United States
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4
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Schmidt JJ, Khatri Y, Brody SI, Zhu C, Pietraszkiewicz H, Valeriote FA, Sherman DH. A Versatile Chemoenzymatic Synthesis for the Discovery of Potent Cryptophycin Analogs. ACS Chem Biol 2020; 15:524-532. [PMID: 31961651 DOI: 10.1021/acschembio.9b00998] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The cryptophycins are a family of macrocyclic depsipeptide natural products that display exceptionally potent antiproliferative activity against drug-resistant cancers. Unique challenges facing the synthesis and derivatization of this complex group of molecules motivated us to investigate a chemoenzymatic synthesis designed to access new analogs for biological evaluation. The cryptophycin thioesterase (CrpTE) and the cryptophycin epoxidase (CrpE) are a versatile set of enzymes that catalyze macrocyclization and epoxidation of over 20 natural cryptophycin metabolites. Thus, we envisioned a drug development strategy involving their use as standalone biocatalysts for production of unnatural derivatives. Herein, we developed a scalable synthesis of 12 new unit A-B-C-D linear chain elongation intermediates containing heterocyclic aromatic groups as alternatives to the native unit A benzyl group. N-Acetyl cysteamine activated forms of each intermediate were assessed for conversion to macrocyclic products using wild type CrpTE, which demonstrated the exceptional flexibility of this enzyme. Semipreparative scale reactions were conducted for isolation and structural characterization of new cryptophycins. Each was then evaluated as a substrate for CrpE P450 and its ability to generate the epoxidized products from these substrates that possess altered electronics at the unit A styrenyl double bond position. Finally, biological evaluation of the new cryptophycins revealed a des-β-epoxy analog with low picomolar potency, previously limited to cryptophycins bearing epoxide functionality.
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Affiliation(s)
| | | | | | | | - Halina Pietraszkiewicz
- Department of Internal Medicine, Henry Ford Cancer Institute, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - Frederick A. Valeriote
- Department of Internal Medicine, Henry Ford Cancer Institute, Henry Ford Health System, Detroit, Michigan 48202, United States
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Johnson TA, Morris JD, Coppage DA, Cook CV, Persi LN, Ogarrio MA, Garcia TC, McIntosh NL, McCauley EP, Media J, Maheshwari M, Valeriote FA, Shaw J, Crews P. Reinvestigation of Mycothiazole Reveals the Penta-2,4-dien-1-ol Residue Imparts Picomolar Potency and 8 S Configuration. ACS Med Chem Lett 2020; 11:108-113. [PMID: 32071675 DOI: 10.1021/acsmedchemlett.9b00302] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 01/02/2020] [Indexed: 12/18/2022] Open
Abstract
Reinvestigation of mycothiazole (1) revealed picomolar potency (IC50 = 0.00016, 0.00027, 0.00035 μM) against pancreatic, (PANC-1), liver (HepG2), and colon (HCT-116) tumor cell lines. Reevaluation of 1 provided [α]D data indicating Vanuatu specimens of C. mycofijiensis contain the 8S enantiomer of 1 and not the 8R configuration previously reported. Semisynthesis provided 8-O-acetylmycothiazole (2), 8-oxomycothiazole (8), mycothiazole nitrosobenzene derivatives (MND1, MND2: 9a, 9b), and MND3 (10) with IC50 = 0.00129, >1.0, >1.0, >1.0, >1.0 μM, respectively, against PANC-1 cell lines. These results highlight the significance of the penta-2,4-dien-1-ol residue as a key structural feature of 1 required for its cytotoxicty against tumor cell lines.
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Affiliation(s)
- Tyler A. Johnson
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
| | - Joseph D. Morris
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - David A. Coppage
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
| | - Colon V. Cook
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Lauren N. Persi
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Marcos A. Ogarrio
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Taylor C. Garcia
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Nicole L. McIntosh
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Erin P. McCauley
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
| | - Joseph Media
- Josephine Ford Cancer Center, Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - Mani Maheshwari
- Josephine Ford Cancer Center, Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - Frederick A. Valeriote
- Josephine Ford Cancer Center, Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - Jiajiu Shaw
- 21st Century Therapeutics, 440 Burroughs, Suite 447, Detroit, Michigan 48202, United States
| | - Phillip Crews
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
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Zou Y, Wang X, Sims J, Wang B, Pandey P, Welsh CL, Stone RP, Avery MA, Doerksen RJ, Ferreira D, Anklin C, Valeriote FA, Kelly M, Hamann MT. Computationally Assisted Discovery and Assignment of a Highly Strained and PANC-1 Selective Alkaloid from Alaska's Deep Ocean. J Am Chem Soc 2019; 141:4338-4344. [PMID: 30758203 DOI: 10.1021/jacs.8b11403] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We report here the orchestration of molecular ion networking and a set of computationally assisted structural elucidation approaches in the discovery of a new class of pyrroloiminoquinone alkaloids that possess selective bioactivity against pancreatic cancer cell lines. Aleutianamine represents the first in a new class of pyrroloiminoquinone alkaloids possessing a highly strained multibridged ring system, discovered from Latrunculia ( Latrunculia) austini Samaai, Kelly & Gibbons, 2006 (class Demospongiae, order Poecilosclerida, family Latrunculiidae) recovered during a NOAA deep-water exploration of the Aleutian Islands. The molecule was identified with the guidance of mass spectrometry, nuclear magnetic resonance, and molecular ion networking (MoIN) analysis. The structure of aleutianamine was determined using extensive spectroscopic analysis in conjunction with computationally assisted quantifiable structure elucidation tools. Aleutianamine exhibited potent and selective cytotoxicity toward solid tumor cell lines including pancreatic cancer (PANC-1) with an IC50 of 25 nM and colon cancer (HCT-116) with an IC50 of 1 μM, and represents a potent and selective candidate for advanced preclinical studies.
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Affiliation(s)
| | - Xiaojuan Wang
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | | | | | | | | | - Robert P Stone
- NOAA Fisheries, Alaska Fisheries Science Center , Auke Bay Laboratories , 17109 Point Lena Loop Road , Juneau , Alaska 99801 , United States
| | | | | | | | - Clemens Anklin
- Bruker BioSpin, 15 Fortune Drive , Billerica , Massachusetts 01821 , United States
| | - Frederick A Valeriote
- Henry Ford Hospital , Department of Internal Medicine, Division of Hematology and Oncology , Detroit , Michigan 48202 , United States
| | - Michelle Kelly
- National Institute of Water and Atmospheric Research (NIWA) Ltd., 41 Market Place, Viaduct Harbour , Auckland 1010 , New Zealand
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
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7
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Caro-Diaz EJE, Valeriote FA, Gerwick WH. Highly Convergent Total Synthesis and Assignment of Absolute Configuration of Majusculamide D, a Potent and Selective Cytotoxic Metabolite from Moorea sp. Org Lett 2019; 21:793-796. [DOI: 10.1021/acs.orglett.8b04050] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eduardo J. E. Caro-Diaz
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093, United States
| | - Frederick A. Valeriote
- Department of Internal Medicine, Henry Ford Cancer Institute, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093, United States
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California 92093, United States
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8
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Almaliti J, Miller B, Pietraszkiewicz H, Glukhov E, Naman CB, Kline T, Hanson J, Li X, Zhou S, Valeriote FA, Gerwick WH. Exploration of the carmaphycins as payloads in antibody drug conjugate anticancer agents. Eur J Med Chem 2019; 161:416-432. [PMID: 30384045 PMCID: PMC6248884 DOI: 10.1016/j.ejmech.2018.10.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 09/25/2018] [Accepted: 10/09/2018] [Indexed: 02/06/2023]
Abstract
Antibody-drug conjugates (ADCs) represent a new dimension of anticancer chemotherapeutics, with warheads to date generally involving either antitubulin or DNA-directed agents to achieve low-to sub-nanomolar potency. However, other potent cytotoxins working by different pharmacological mechanisms are under investigation, such as α,β-epoxyketone based proteasome inhibitors. These proteasome active agents are an emerging class of anticancer drug that possesses ultra-potent cytotoxicity to some cancer cell lines. The carmaphycins are representatives of this latter class that we isolated and characterized from a marine cyanobacterium, and these as well as several synthetic analogues exhibit this level of potency. In the current work, we investigated the use of these highly potent cytotoxic compounds as warheads in the design of novel ADCs. We designed and synthesized a library of carmaphycin B analogues that contain amine handles, enabling their attachment to an antibody linker. The basicity of these incorporated amine handles was shown to strongly affect their cytotoxic properties. Linear amines resulted in the greatest reduction in cytotoxicity whereas less basic aromatic amines retained potent activity as demonstrated by a 4-sulfonylaniline derivative. These investigations resulted in identifying the P2 residue in the carmaphycins as the most suitable site for linker attachment point, and hence, we synthesized a highly potent analogue of carmaphycin B that contained a 4-sulfonylaniline handle as an attachment point for the linker antibody.
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Affiliation(s)
- Jehad Almaliti
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, 92093, United States; Department Pharmaceutical Sciences, College of Pharmacy, The University of Jordan, Amman, 11942, Jordan
| | - Bailey Miller
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, 92093, United States
| | - Halina Pietraszkiewicz
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Hospital, Detroit, MI, 48202, USA
| | - Evgenia Glukhov
- Department Pharmaceutical Sciences, College of Pharmacy, The University of Jordan, Amman, 11942, Jordan
| | - C Benjamin Naman
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, 92093, United States; College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Toni Kline
- Sutro Biopharma, South San Francisco, CA, 94080, United States
| | - Jeffrey Hanson
- Sutro Biopharma, South San Francisco, CA, 94080, United States
| | - Xiaofan Li
- Sutro Biopharma, South San Francisco, CA, 94080, United States
| | - Sihong Zhou
- Sutro Biopharma, South San Francisco, CA, 94080, United States
| | - Frederick A Valeriote
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Hospital, Detroit, MI, 48202, USA
| | - William H Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, 92093, United States; Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, 92093, United States.
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Wang X, Liu J, Pandey P, Fronczek FR, Doerksen RJ, Chen J, Qi X, Zhang P, Ferreira D, Valeriote FA, Sun H, Li S, Hamann MT. Computationally Assisted Assignment of the Kadsuraols, a Class of Chemopreventive Agents for the Control of Liver Cancer. Org Lett 2018; 20:5559-5563. [PMID: 30192555 DOI: 10.1021/acs.orglett.8b02207] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Kadsuraols A-C (1-3), which are tetrahydrocyclobutaphenanthrofuranone-type lignans with a new carbon skeleton comprising a four-membered ring across C-1'-C-8, have been isolated from the roots of Kadsura longipedunculata. Their structures and absolute configurations were unambiguously determined using nuclear magnetic resonance, X-ray diffraction crystallography, DP4+ calculations, and computed and experimental electronic circular dichroism spectra. Kadsuraol C (3) exhibited hepatoprotective activity against N-acetyl- p-aminophenol (APAP)-induced toxicity. The compounds showed no cytotoxicity at 10 μM in a zone assay.
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Affiliation(s)
- Xiaojuan Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China.,Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | - Jiabao Liu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | - Frank R Fronczek
- Department of Chemistry , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | | | - Jiabao Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Xinzhu Qi
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Peicheng Zhang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | - Frederick A Valeriote
- Department of Internal Medicine, Division of Hematology and Oncology , Henry Ford Health System , Detroit , Michigan 48202 , United States
| | - Hua Sun
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Shuai Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
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Cook CV, Johnson TA, Coppage D, McIntosh NL, Ogarrio MA, Tenney K, Valeriote FA, Crews P. PREPARATION AND CYTOTOXICITY EVALUATION OF ACETYLATED FIJIANOLIDES (A.K.A. LAULIMALIDE). FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.836.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Colon V. Cook
- Department of Natural Sciences and MathematicsDominican University of CaliforniaSan RafaelCA
| | - Tyler A. Johnson
- Department of Natural Sciences and MathematicsDominican University of CaliforniaSan RafaelCA
| | - David Coppage
- Department of Chemistry and BiochemistryUniversity of CaliforniaSanta CruzSanta CruzCA
| | - Nicole L. McIntosh
- Department of Natural Sciences and MathematicsDominican University of CaliforniaSan RafaelCA
| | - Marcos A. Ogarrio
- Department of Natural Sciences and MathematicsDominican University of CaliforniaSan RafaelCA
| | - Karen Tenney
- Department of Chemistry and BiochemistryUniversity of CaliforniaSanta CruzSanta CruzCA
| | - Frederick A. Valeriote
- Department of Internal MedicineDivision of Hematology and OncologyHenry Ford HospitalDetroitMI
| | - Phillip Crews
- Department of Chemistry and BiochemistryUniversity of CaliforniaSanta CruzSanta CruzCA
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11
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Lorig-Roach N, Hamkins-Indik F, Johnson TA, Tenney K, Valeriote FA, Crews P. The potential of achiral sponge-derived and synthetic bromoindoles as selective cytotoxins against PANC-1 tumor cells. Tetrahedron 2018; 74:217-223. [PMID: 29576661 PMCID: PMC5863921 DOI: 10.1016/j.tet.2017.11.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Our quest to isolate and characterize natural products with in vitro solid tumor selectivity is driven by access to repositories of Indo-Pacific sponge extracts. In this project an extract of a species of Haplosclerida sponge obtained from the US NCI Natural Products Repository displayed, by in vitro disk diffusion assay (DDA) and IC50 determinations, selective cytotoxicity with modest potency to a human pancreatic cancer cell line (PANC-1) relative to the human lymphoblast leukemia cell line (CCRF-CEM). Two brominated indoles, the known 6-bromo conicamin (1) and the new derivative, 6-Br-8-keto-conicamin A (2), were identified and 2 (IC50 1.5 μM for the natural product vs 4.1 μM for the synthetic material) was determined to be responsible for the cytotoxic activity of the extract against the PANC-1 tumor cell line. The new natural product and ten additional analogs were prepared for further SAR testing.
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Affiliation(s)
- Nicholas Lorig-Roach
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, United States
| | - Frances Hamkins-Indik
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, United States
| | - Tyler A. Johnson
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, United States
| | - Karen Tenney
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, United States
| | - Frederick A. Valeriote
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Hospital, Detroit Michigan 48202, United States
| | - Phillip Crews
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, United States
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13
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McCauley EP, Lam H, Lorig-Roach N, Luu J, Lloyd C, Tenney K, Pietraszkiewicz H, Diaz C, Valeriote FA, Auerbuch V, Crews P. Investigation of the Physical and Bioactive Properties of Bromo- and Iodo-Containing Sponge-Derived Compounds Possessing an Oxyphenylethanamine Core. J Nat Prod 2017; 80:3255-3266. [PMID: 29144750 DOI: 10.1021/acs.jnatprod.7b00694] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This research set out to identify compounds from marine sponges that can act as bacterial virulence blockers. Extracts from a total of 80 sponges collected from throughout Indonesia were screened in a high-throughput NF-κB-based screen that identifies compounds capable of inhibiting the bacterial type III secretion system (T3SS) in Yersinia pseudotuberculosis. An extract that was shown to inhibit T3SS-driven NF-κB expression was obtained from an Iotrochota cf. iota sponge and was the source of seven new bromo- and iodo-containing compounds, all of which contain a 2-(4-oxyphenyl)ethan-1-amine core. Five were determined to be new compounds and named enisorines A-E (1-5). The remaining two were determined to be new hemibastadinol analogues named (+)-1-O-methylhemibastadinol 2 (6) and (+)-1-O-methylhemibastadinol 4 (7). All seven compounds inhibited T3SS-dependent YopE secretion and did not affect the growth or metabolic activity of Y. pseudotuberculosis. The most potent inhibitors of T3SS activity were enisorine C (3), enisorine E (5), and (+)-1-O-methylhemibastadinol 2 (6), all of which inhibited YopE secretion by >50% at 30 μM.
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Affiliation(s)
- Erin P McCauley
- Department of Chemistry and Biochemistry, University of California , Santa Cruz, California 95064, United States
| | - Hanh Lam
- Department of Microbiology and Environmental Toxicology, University of California , Santa Cruz, California 95064, United States
| | - Nicholas Lorig-Roach
- Department of Chemistry and Biochemistry, University of California , Santa Cruz, California 95064, United States
| | - Justin Luu
- Department of Microbiology and Environmental Toxicology, University of California , Santa Cruz, California 95064, United States
| | - Cameron Lloyd
- Department of Microbiology and Environmental Toxicology, University of California , Santa Cruz, California 95064, United States
| | - Karen Tenney
- Department of Chemistry and Biochemistry, University of California , Santa Cruz, California 95064, United States
| | - Halina Pietraszkiewicz
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Hospital , Detroit, Michigan 48202, United States
| | - Cristina Diaz
- Harbor Branch Oceanographic Institute, Florida Atlantic University , Fort Pierce, Florida 34946, United States
| | - Frederick A Valeriote
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Hospital , Detroit, Michigan 48202, United States
| | - Victoria Auerbuch
- Department of Microbiology and Environmental Toxicology, University of California , Santa Cruz, California 95064, United States
| | - Phillip Crews
- Department of Chemistry and Biochemistry, University of California , Santa Cruz, California 95064, United States
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14
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Zhang H, Crews P, Tenney K, Valeriote FA. Cytotoxic Phyllactone Analogs from the Marine Sponge Phyllospongia papyrecea. Med Chem 2017; 13:295-300. [PMID: 27748180 DOI: 10.2174/1573406412666161007150828] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 09/17/2016] [Accepted: 09/30/2016] [Indexed: 11/22/2022]
Abstract
BACKGROUND A growing evidence indicates that marine sponge Phyllospongia sp. is one of rich sources of 20, 24-bishomoscalarane sesterterpenes with potent biological activities. In order to search more bioactive 20, 24-bishomoscalarane sesterterpenes for new drug discovery, chemical investigation was carried out on an Indonesian marine sponge P. papyrecea. METHODS Bioassay-guided fractionation was carried out on its dichloromethane extract. And nine compounds were purified and isolated using HPLC. Their chemical structures were determined by a combination of spectroscopic and spectrometric data, including 1D-, 2D-NMR and HRESI-MS. Their cytotoxic activities were performed on three human tumor cell lines A549, MCF-7 and HeLa using the CCK-8 method. RESULTS One new 20, 24-bishomoscalarane sesterterpene, phyllactone H (9), was isolated and elucidated together with phyllactones A-B (1-2) and D-G (3-6), 12α, 24-dihydroxy-20, 24-dimethyl-15, 17- scalaradien-25, 24-olides (7-8). Compounds 1 and 2, 3 and 4, 5 and 6, 7 and 8 were C-24 anomers and inseparable mixtures, respectively. The 1H and 13C-NMR data for 7/8 were firstly reported in this paper. CONCLUSION Compounds 1-9 possessed in vitro moderate cytotoxicities against A549, MCF-7 and HeLa cells with IC50 values of less than 25 μM.
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Affiliation(s)
- Huawei Zhang
- School of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, China
| | - Phillip Crews
- Department of Chemistry & Biochemistry, University of California-Santa Cruz, CA 95064, United States
| | - Karen Tenney
- Department of Chemistry & Biochemistry, University of California-Santa Cruz, CA 95064, United States
| | - Frederick A Valeriote
- Josephine Ford Cancer Institute, Henry Ford Health System, Detroit, Michigan 48202, United States
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15
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Naman CB, Rattan R, Nikoulina SE, Lee J, Miller BW, Moss NA, Armstrong L, Boudreau PD, Debonsi HM, Valeriote FA, Dorrestein PC, Gerwick WH. Integrating Molecular Networking and Biological Assays To Target the Isolation of a Cytotoxic Cyclic Octapeptide, Samoamide A, from an American Samoan Marine Cyanobacterium. J Nat Prod 2017; 80:625-633. [PMID: 28055219 PMCID: PMC5758054 DOI: 10.1021/acs.jnatprod.6b00907] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Integrating LC-MS/MS molecular networking and bioassay-guided fractionation enabled the targeted isolation of a new and bioactive cyclic octapeptide, samoamide A (1), from a sample of cf. Symploca sp. collected in American Samoa. The structure of 1 was established by detailed 1D and 2D NMR experiments, HRESIMS data, and chemical degradation/chromatographic (e.g., Marfey's analysis) studies. Pure compound 1 was shown to have in vitro cytotoxic activity against several human cancer cell lines in both traditional cell culture and zone inhibition bioassays. Although there was no particular selectivity between the cell lines tested for samoamide A, the most potent activity was observed against H460 human non-small-cell lung cancer cells (IC50 = 1.1 μM). Molecular modeling studies suggested that one possible mechanism of action for 1 is the inhibition of the enzyme dipeptidyl peptidase (CD26, DPP4) at a reported allosteric binding site, which could lead to many downstream pharmacological effects. However, this interaction was moderate when tested in vitro at up to 10 μM and only resulted in about 16% peptidase inhibition. Combining bioassay screening with the cheminformatics strategy of LC-MS/MS molecular networking as a discovery tool expedited the targeted isolation of a natural product possessing both a novel chemical structure and a desired biological activity.
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Affiliation(s)
- C. Benjamin Naman
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
| | - Ramandeep Rattan
- Division of Gynecology Oncology, Department of Women’s Health Services, Henry Ford Hospital, Detroit, Michigan 48202, United States
| | - Svetlana E. Nikoulina
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
| | - John Lee
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
| | - Bailey W. Miller
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
| | - Nathan A. Moss
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
| | - Lorene Armstrong
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Avenida Do Café, s/n, Campus Universitario, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Paul D. Boudreau
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
| | - Hosana M. Debonsi
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Avenida Do Café, s/n, Campus Universitario, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Frederick A. Valeriote
- Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Hospital, Detroit, Michigan 48202, United States
| | - Pieter C. Dorrestein
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, United States
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
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16
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Deeb D, Gao X, Liu YB, Zhang Y, Shaw J, Valeriote FA, Gautam SC. Inhibition of hTERT in pancreatic cancer cells by pristimerin involves suppression of epigenetic regulators of gene transcription. Oncol Rep 2017. [DOI: 10.3892/or.2017.5400] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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17
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Liu Y, Gao X, Deeb D, Zhang Y, Shaw J, Valeriote FA, Gautam SC. Mycotoxin verrucarin A inhibits proliferation and induces apoptosis in prostate cancer cells by inhibiting prosurvival Akt/NF-kB/mTOR signaling. J Exp Ther Oncol 2016; 11:251-260. [PMID: 27849335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 05/26/2016] [Indexed: 06/06/2023]
Abstract
Trichothecenes are powerful mycotoxins that inhibit protein synthesis and induce ribotoxic stress response in mammalian cells. Verrucarin A (VC-A) is a Type D macrocyclic mycotoxin which inhibits cell proliferation and induces apoptosis in cancer cells. However, the antitumor activity of VC-A for prostate cancer cells has not been investigated. The objective of the present study was to determine the anticancer activity and its mechanism of action in hormone-responsive (LNCaP) and hormone-refractory (PC-3) carcinoma of the prostate (CaP) cell lines. VC-A strongly inhibited the proliferation and induced cell cycle arrest in G2/M phase associated with the inhibition of cell cycle regulatory proteins cyclin D, cyclin E, cyclin-dependent kinases (cdks) cdk2, cdk4, cdk6 and cdk inhibitors WAF1/21 and KIP1/27. VC-A also induced apoptosis in CaP cells as characterized by the cleavage of poly (ADP-ribose) polymerase (PARP-1), procaspases-3, -8 and -9 and the inhibition of Bcl-2 family proteins that regulate apoptosis (Bcl-2, Bcl-xL, Bax, Bak and Bad). In addition, VC-A also down-regulated the expression of prosurvival phospho-AKT (p-AKT), nuclear factor kappa B (NF-kB) (p65) and phospho-mammalian target of rapamycin (p-mTOR) signaling proteins. Taken together, these results demonstrated strong antiproliferative and apoptosis-inducing activity of verrucarin A against CaP cells through cell cycle arrest and inhibition of the prosurvival (antiapoptotic) AKT/NF-kB/mTOR signaling pathway.
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Affiliation(s)
- Yongbo Liu
- Department of Surgery, Henry Ford Health System, Detroit, Michigan, USA
| | - Xiaohua Gao
- Department of Surgery, Henry Ford Health System, Detroit, Michigan, USA
| | - Dorrah Deeb
- Department of Surgery, Henry Ford Health System, Detroit, Michigan, USA
| | - Yiguan Zhang
- Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan, USA
| | - Jiajiu Shaw
- Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan, USA
| | | | - Subhash C Gautam
- Department of Surgery, Henry Ford Health System, Detroit, Michigan, USA
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18
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Abstract
As a result of our efforts to identify bioactive agents from marine algae, we have isolated and identified one new halogenated monoterpene 1 [(-)-(5E,7Z)-348-trichloro-7-dichloromethyl-3-methyl-157-octatriene] in addition to three known compounds (2, 3 and 4) from the red alga Plocamium cartilagineum collected by hand from the eastern coast of South Africa. Compound 1 was found to be active as a cytotoxic agent in human lung cancer (NCI-H460) and mouse neuro-2a cell lines (IC50 4 μg/mL). Two of these compounds (3 and 4) were found to have cytotoxic activity in other cell line assays, especially against human leukaemia and human colon cancers (IC50 1.3 μg/mL). None of these metabolites were active as sodium channel blockers or activators. All structures were determined by spectroscopic methods (UV, IR, LRMS, HRMS, 1D NMR and 2D NMR). 1D and 2D NOE experiments were carried out on these compounds to confirm the geometry of the double bonds.
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Affiliation(s)
- Omar M M Sabry
- a College of Pharmacy , Oregon State University , Corvallis , OR , USA.,b Faculty of Pharmacy , Cairo University , Cairo , Egypt
| | - Douglas E Goeger
- a College of Pharmacy , Oregon State University , Corvallis , OR , USA
| | - Frederick A Valeriote
- c Division of Hematology and Oncology Department of Internal Medicine , Henry Ford Hospital , Detroit , MI , USA
| | - William H Gerwick
- a College of Pharmacy , Oregon State University , Corvallis , OR , USA.,d Center for Marine Biotechnology and Biomedicine , Scripps Institution of Oceanography, University of California , San Diego , CA , USA
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19
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Deeb D, Gao X, Liu Y, Zhang Y, Shaw J, Valeriote FA, Gautam SC. The inhibition of cell proliferation and induction of apoptosis in pancreatic ductal adenocarcinoma cells by verrucarin A, a macrocyclic trichothecene, is associated with the inhibition of Akt/NF-κB/mTOR prosurvival signaling. Int J Oncol 2016; 49:1139-47. [DOI: 10.3892/ijo.2016.3587] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 06/16/2016] [Indexed: 11/05/2022] Open
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20
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Zhou Q, Abraham AD, Li L, Babalmorad A, Bagby S, Arcaroli JJ, Hansen RJ, Valeriote FA, Gustafson DL, Schaack J, Messersmith WA, LaBarbera DV. Topoisomerase IIα mediates TCF-dependent epithelial-mesenchymal transition in colon cancer. Oncogene 2016; 35:4990-9. [PMID: 26947016 PMCID: PMC5036162 DOI: 10.1038/onc.2016.29] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 12/16/2015] [Accepted: 01/06/2016] [Indexed: 12/23/2022]
Abstract
Aberrant T-cell factor (TCF) transcription is implicated in the majority of colorectal cancers (CRCs). TCF transcription induces epithelial–mesenchymal transition (EMT), promoting a tumor-initiating cell (TIC) phenotype characterized by increased proliferation, multidrug resistance (MDR), invasion and metastasis. The data presented herein characterize topoisomerase IIα (TopoIIα) as a required component of TCF transcription promoting EMT. Using chromatin immunoprecipitation (ChIP) and protein co-immunoprecipitation (co-IP) studies, we show that TopoIIα forms protein–protein interactions with β-catentin and TCF4 and interacts with Wnt response elements (WREs) and promoters of direct target genes of TCF transcription, including: MYC, vimentin, AXIN2 and LEF1. Moreover, both TopoIIα and TCF4 ChIP with the N-cadherin promoter, which is a new discovery indicating that TCF transcription may directly regulate N-cadherin expression. TopoIIα N-terminal ATP-competitive inhibitors, exemplified by the marine alkaloid neoamphimedine (neo), block TCF activity in vitro and in vivo. Neo effectively inhibits TopoIIα and TCF4 from binding WREs/promoter sites, whereas protein–protein interactions remain intact. Neo inhibition of TopoIIα-dependent TCF transcription also correlates with significant antitumor effects in vitro and in vivo, including the reversion of EMT, the loss of TIC-mediated clonogenic colony formation, and the loss of cell motility and invasion. Interestingly, non-ATP-competitive inhibitors of TopoIIα, etoposide and merbarone, were ineffective at preventing TopoIIα-dependent TCF transcription. Thus, we propose that TopoIIα participation in TCF transcription may convey a mechanism of MDR to conventional TopoIIα inhibitors. However, our results indicate that TopoIIα N-terminal ATP-binding sites remain conserved and available for drug targeting. This article defines a new strategy for targeted inhibition of TCF transcription that may lead to effective therapies for the treatment of CRC and potentially other Wnt-dependent cancers.
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Affiliation(s)
- Q Zhou
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - A D Abraham
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - L Li
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - A Babalmorad
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - S Bagby
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - J J Arcaroli
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Division of Medical Oncology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - R J Hansen
- Division of Medical Oncology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,University of Colorado Cancer Center, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - F A Valeriote
- Colorado State University, Flint Animal Cancer Center, Fort Collins, CO, USA
| | - D L Gustafson
- Division of Medical Oncology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,University of Colorado Cancer Center, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - J Schaack
- Division of Medical Oncology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Josephine Ford Cancer Center, Henry Ford Health Systems, Detroit, MI, USA
| | - W A Messersmith
- Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Division of Medical Oncology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - D V LaBarbera
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.,Division of Medical Oncology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
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21
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Wang B, Waters AL, Valeriote FA, Hamann MT. An efficient and cost-effective approach to kahalalide F N-terminal modifications using a nuisance algal bloom of Bryopsis pennata. Biochim Biophys Acta Gen Subj 2015; 1850:1849-54. [PMID: 25964068 DOI: 10.1016/j.bbagen.2015.05.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Revised: 04/27/2015] [Accepted: 05/04/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Kahalalide F (KF) and its isomer iso-kahalalide F (isoKF), both of which can be isolated from the mollusk Elysia rufescens and its diet alga Bryopsis pennata, are potent cytotoxic agents that have advanced through five clinical trials. Due to a short half-life, narrow spectrum of activity, and a modest response in patients, further efforts to modify the molecule are required to address its limitations. In addition, due to the high cost in producing KF analogues using solid phase peptide synthesis (SPPS), a degradation and reconstruction approach was employed using natural KF from a seasonal algal bloom to generate KF analogues. METHODS N-protected KF was carefully hydrolyzed at the amide linkage between l-Thr12 and d-Val13 using dilute HCl. The synthesis of the C-terminal fragment began with the formation of hexanoic succinimide ester, followed by a reaction with dipeptides. The final coupling reaction was performed between the semisynthesized Fmoc-KF hydrolysis product and the C-terminal fragment, followed by the deprotection of the Fmoc group. RESULTS Six KF analogues with an addition of an amino acid residue on the N-terminal chain, d-Val14-isoKF (2), Val13-Val14-isoKF (3), d-Leu14-isoKF (4), d-Pro14-isoKF (5), d-Phe14-isoKF (6), and 3,4-2F-d-Phe14-isoKF (7) were prepared using semisynthesis at the exposed N-terminal chain. CONCLUSIONS The overall yield of the medication was 45%. This approach is economical, efficient and amendable to large-scale production while eliminated a nuisance algal bloom. GENERAL SIGNIFICANCE B. pennata blooms are capable of producing KF in good yields. The semisynthesis from the natural product produced N-terminal modifications for the construction of inexpensive semisynthetic KF libraries.
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Affiliation(s)
- Bin Wang
- Division of Pharmacognosy, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA
| | - Amanda L Waters
- Division of Pharmacognosy, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA
| | - Frederick A Valeriote
- Henry Ford Health System, Department of Internal Medicine, Division of Hematology and Oncology, Detroit, MI 48202, USA
| | - Mark T Hamann
- Division of Pharmacognosy, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA; Division of Pharmacology, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA; Department of Chemistry and Biochemistry and National Center for Natural Products Research, The University of Mississippi, University, MS 38677, USA.
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22
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Theodore CM, Lorig-Roach N, Still PC, Johnson TA, Drašković M, Schwochert JA, Naphen CN, Crews MS, Barker SA, Valeriote FA, Lokey RS, Crews P. Biosynthetic products from a nearshore-derived gram-negative bacterium enable reassessment of the kailuin depsipeptides. J Nat Prod 2015; 78:441-52. [PMID: 25699470 PMCID: PMC4699550 DOI: 10.1021/np500840n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Sampling of California nearshore sediments resulted in the isolation of a Gram-negative bacterium, Photobacterium halotolerans, capable of producing unusual biosynthetic products. Liquid culture in artificial seawater-based media provided cyclic depsipeptides including four known compounds, kailuins B-E (2-5), and two new analogues, kailuins G and H (7 and 8). The structures of the new and known compounds were confirmed through extensive spectroscopic and Marfey's analyses. During the course of these studies, a correction was made to the previously reported double-bond geometry of kailuin D (4). Additionally, through the application of a combination of derivatization with Mosher's reagent and extensive (13)C NMR shift analysis, the previously unassigned chiral center at position C-3 of the β-acyloxy group of all compounds was determined. To evaluate bioactivity and structure-activity relationships, the kailuin core (13) and kailuin lactam (14) were prepared by chiral synthesis using an Fmoc solid-phase peptide strategy followed by solution-phase cyclization. All isolated compounds and synthetic cores were assayed for solid tumor cell cytotoxicity and showed only minimal activity, contrary to other published reports. Additional phenotypic screenings were done on 4 and 5, with little evidence of activity.
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Affiliation(s)
- Christine M. Theodore
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Nicholas Lorig-Roach
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Patrick C. Still
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Tyler A. Johnson
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Marija Drašković
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Joshua A. Schwochert
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Cassandra N. Naphen
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Mitchell S. Crews
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Simone A. Barker
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Frederick A. Valeriote
- Josephine Ford Cancer Center, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - R. Scott Lokey
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Phillip Crews
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
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23
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Morgan JB, Liu Y, Coothankandaswamy V, Mahdi F, Jekabsons MB, Gerwick WH, Valeriote FA, Zhou YD, Nagle DG. Kalkitoxin inhibits angiogenesis, disrupts cellular hypoxic signaling, and blocks mitochondrial electron transport in tumor cells. Mar Drugs 2015; 13:1552-68. [PMID: 25803180 PMCID: PMC4377999 DOI: 10.3390/md13031552] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 03/07/2015] [Accepted: 03/11/2015] [Indexed: 01/07/2023] Open
Abstract
The biologically active lipopeptide kalkitoxin was previously isolated from the marine cyanobacterium Moorea producens (Lyngbya majuscula). Kalkitoxin exhibited N-methyl-D-aspartate (NMDA)-mediated neurotoxicity and acted as an inhibitory ligand for voltage-sensitive sodium channels in cultured rat cerebellar granule neurons. Subsequent studies revealed that kalkitoxin generated a delayed form of colon tumor cell cytotoxicity in 7-day clonogenic cell survival assays. Cell line- and exposure time-dependent cytostatic/cytotoxic effects were previously observed with mitochondria-targeted inhibitors of hypoxia-inducible factor-1 (HIF-1). The transcription factor HIF-1 functions as a key regulator of oxygen homeostasis. Therefore, we investigated the ability of kalkitoxin to inhibit hypoxic signaling in human tumor cell lines. Kalkitoxin potently and selectively inhibited hypoxia-induced activation of HIF-1 in T47D breast tumor cells (IC50 5.6 nM). Mechanistic studies revealed that kalkitoxin inhibits HIF-1 activation by suppressing mitochondrial oxygen consumption at electron transport chain (ETC) complex I (NADH-ubiquinone oxidoreductase). Further studies indicate that kalkitoxin targets tumor angiogenesis by blocking the induction of angiogenic factors (i.e., VEGF) in tumor cells.
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Affiliation(s)
- J Brian Morgan
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677, USA.
| | - Yang Liu
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677, USA.
| | - Veena Coothankandaswamy
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677, USA.
| | - Fakhri Mahdi
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677, USA.
| | - Mika B Jekabsons
- Department of Biology, University of Mississippi, University, MS 38677, USA.
| | - William H Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA 920933, USA.
| | - Frederick A Valeriote
- Department of Internal Medicine, Division of Hematology and Oncology, Henry Ford Hospital, Detroit, MI 48202, USA.
| | - Yu-Dong Zhou
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677, USA.
| | - Dale G Nagle
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677, USA.
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Vogel CV, Pietraszkiewicz H, Sabry OM, Gerwick WH, Valeriote FA, Vanderwal CD. Enantioselective divergent syntheses of several polyhalogenated Plocamium monoterpenes and evaluation of their selectivity for solid tumors. Angew Chem Int Ed Engl 2014; 53:12205-9. [PMID: 25220828 PMCID: PMC4219742 DOI: 10.1002/anie.201407726] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 08/20/2014] [Indexed: 11/10/2022]
Abstract
The family of polyhalogenated monoterpenes from Plocamium counts over a hundred known members. Using glyceraldehyde acetonide as a chiral-pool precursor, an enantioselective and divergent strategy was developed that provides a blueprint for the synthesis of many of the small yet complex acyclic members of this family. The broad applicability of this approach is demonstrated with the short, eight-step synthesis of four natural products and three analogues. These syntheses are the first of any members of the acyclic polyhalogenated Plocamium monoterpenes and permitted the evaluation of their selectivity against a range of tumor cell lines.
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Affiliation(s)
- Carl V. Vogel
- 1102 Natural Sciences II, Department of Chemistry, University of California, Irvine, Irvine, CA 92697 USA
| | - Halina Pietraszkiewicz
- Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Hospital, Detroit, MI 48202 USA
| | - Omar M. Sabry
- College of Pharmacy, Oregon State University, Corvallis, OR 97331 USA
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093 USA
| | - Frederick A. Valeriote
- Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Hospital, Detroit, MI 48202 USA
| | - Christopher D. Vanderwal
- 1102 Natural Sciences II, Department of Chemistry, University of California, Irvine, Irvine, CA 92697 USA
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Vogel CV, Pietraszkiewicz H, Sabry OM, Gerwick WH, Valeriote FA, Vanderwal CD. Enantioselective Divergent Syntheses of Several PolyhalogenatedPlocamiumMonoterpenes and Evaluation of Their Selectivity for Solid Tumors. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407726] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Rodríguez J, Nieto RM, Blanco M, Valeriote FA, Jiménez C, Crews P. Thelepamide: an unprecedented ketide-amino acid from Thelepus crispus, a marine annelid worm. Org Lett 2013; 16:464-7. [PMID: 24359301 DOI: 10.1021/ol403350e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Thelepamide (1) was characterized during a program to study cytotoxic substances from an unusual source, the tidal zone-derived annelid Thelephus crispus. Its structure contains a tetraketide and a tripeptide subunit and possesses striking atom diversity, consisting of 17 carbons and 8 heteroatoms. The relative configurations at four chiral sites were elucidated via ROESY, J-based configurational analysis, and DFT calculations. It was modestly active against leukemia cells (IC50 = 5 μg/mL) and inactive against solid tumor cell lines.
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Affiliation(s)
- Jaime Rodríguez
- Departamento de Química Fundamental, Facultade de Ciencias and Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña , 15071 A Coruña, Spain
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Martín-Gálvez F, García-Ruiz C, Sánchez-Ruiz A, Valeriote FA, Sarabia F. An array of bengamide E analogues modified at the terminal olefinic position: synthesis and antitumor properties. ChemMedChem 2013; 8:819-31. [PMID: 23512621 DOI: 10.1002/cmdc.201300033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Indexed: 12/12/2022]
Abstract
Based on our previously described synthetic strategy for bengamide E, a natural product of marine origin with antitumor activity, a small library of analogues modified at the terminal olefinic position was generated with the objective of investigating the effect of structural modifications on antitumor properties. Biological evaluation of these analogues, consisting of IC50 determinations against various tumor cell lines, revealed important aspects with respect to the structural requirements of this olefinic position for activity. Interestingly, the analogue possessing a cyclopentyl group displayed greater potency than the parent bengamide E, representing a key finding upon which to base further investigations into the design of new analogues with promising biological activities.
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Affiliation(s)
- Francisca Martín-Gálvez
- Department of Organic Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n. 29071 Málaga, Spain
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Uddin G, Din AU, Khurshid A, Valeriote FA, Choudhary MI. Analytical Characterization of Fatty Acids Composition of Bioactive Stem Oil of Maytenus royleanusby Gas Chromatography Mass Spectrometry. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201100686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Choi H, Mevers E, Byrum T, Valeriote FA, Gerwick WH. Lyngbyabellins K-N from Two Palmyra Atoll Collections of the Marine Cyanobacterium Moorea bouillonii. European J Org Chem 2012; 2012:5141-5150. [PMID: 24574859 DOI: 10.1002/ejoc.201200691] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Five lipopeptides of the lyngbyabellin structure class, four cyclic (1-3, and 5) and one linear (4), were isolated from the extracts of two collections of filamentous marine cyanobacteria obtained from Palmyra Atoll in the Central Pacific Ocean. Their planar structures and absolute configurations were elucidated by combined spectroscopic and chromatographic analyses as well as chemical synthesis of fragments. In addition to structural features typical of the lyngbyabellins, such as two thiazole rings and a chlorinated 2-methyloctanoate residue, these new compounds possess several unique aspects. Of note, metabolites 2 and 3 possessed rare mono-chlorination on the 3-acyloxy-2-methyloctanoate residue while lyngbyabellin N (5) had an unusual N,N-dimethylvaline terminus. Lyngbyabellin N also possessed a leucine statine residue, and showed strong cytotoxic activity against HCT116 colon cancer cell line (IC50 = 40.9 ± 3.3 nM).
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Affiliation(s)
- Hyukjae Choi
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Dr. MC 0212, La Jolla, CA, 92093, USA
| | - Emily Mevers
- Department of Chemistry and Biochemistry, University of California San Diego,9500 Gilman Dr., La Jolla, CA, 92093, USA
| | - Tara Byrum
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Dr. MC 0212, La Jolla, CA, 92093, USA
| | - Frederick A Valeriote
- Division of Hematology & Oncology, Department of Internal Medicine, Henry Ford Hospital, Detroit, MI, 48202, USA
| | - William H Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Dr. MC 0212, La Jolla, CA, 92093, USA.,Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA, 92093, USA
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30
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Johnson TA, Sohn J, Vaske YM, White KN, Cohen TL, Vervoort HC, Tenney K, Valeriote FA, Bjeldanes LF, Crews P. Myxobacteria versus sponge-derived alkaloids: the bengamide family identified as potent immune modulating agents by scrutiny of LC-MS/ELSD libraries. Bioorg Med Chem 2012; 20:4348-55. [PMID: 22705020 PMCID: PMC3417756 DOI: 10.1016/j.bmc.2012.05.043] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 05/08/2012] [Accepted: 05/17/2012] [Indexed: 12/12/2022]
Abstract
A nuclear factor-κB (NF-κB) luciferase assay has been employed to identify the bengamides, previously known for their anti-tumor activity, as a new class of immune modulators. A unique element of this study was that the bengamide analogs were isolated from two disparate sources, Myxococcus virescens (bacterium) and Jaspis coriacea (sponge). Comparative LC-MS/ELSD and NMR analysis facilitated the isolation of M. viriscens derived samples of bengamide E (8) and two congeners, bengamide E' (13) and F' (14) each isolated as an insperable mixture of diastereomers. Additional compounds drawn from the UC, Santa Cruz repository allowed expansion of the structure activity relationship (SAR) studies. The activity patterns observed for bengamide A (6), B (7), E (8), F (9), LAF 389 (12) and 13-14 gave rise to the following observations and conclusions. Compounds 6 and 7 display potent inhibition of NF-κB (at 80 and 90 nM, respectively) without cytotoxicity to RAW264.7 macrophage immune cells. Western blot and qPCR analysis indicated that 6 and 7 reduce the phosphorylation of IκBα and the LPS-induced expression of the pro-inflammatory cytokines/chemokines TNFα, IL-6 and MCP-1 but do not effect NO production or the expression of iNOS. These results suggest that the bengamides may serve as therapeutic leads for the treatment of diseases involving inflammation, that their anti-tumor activity can in part be attributed to their ability to serve as immune modulating agents, and that their therapeutic potential against cancer merits further consideration.
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Affiliation(s)
- Tyler A. Johnson
- Department of Nutritional Sciences & Toxicology, University of California, Berkeley, California 94720
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, California 95064
| | - Johann Sohn
- Department of Nutritional Sciences & Toxicology, University of California, Berkeley, California 94720
| | - Yvette M. Vaske
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, California 95064
| | - Kimberly N. White
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, California 95064
| | - Tanya L. Cohen
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, California 95064
| | - Helene C. Vervoort
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, California 95064
| | - Karen Tenney
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, California 95064
| | | | - Leonard F. Bjeldanes
- Department of Nutritional Sciences & Toxicology, University of California, Berkeley, California 94720
| | - Phillip Crews
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, California 95064
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31
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Jiang HL, Luo XH, Wang XZ, Yang JL, Yao XJ, Crews P, Valeriote FA, Wu QX. New isocoumarins and alkaloid from Chinese insect medicine, Eupolyphaga sinensis Walker. Fitoterapia 2012; 83:1275-80. [PMID: 22735600 DOI: 10.1016/j.fitote.2012.06.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 06/12/2012] [Accepted: 06/15/2012] [Indexed: 11/17/2022]
Abstract
Two new isocoumarins (1 and 2), a new alkaloid (3), and a known N-acetyldopamine dimer (4) were isolated from the ethyl acetate extract of Chinese insect medicine Eupolyphaga sinensis. Their structures were elucidated on the basis of detailed spectroscopic investigations, such as 1D- and 2D NMR spectroscopy, as well as by means of HR-MS. The structure of 1 was firmly confirmed by X-ray crystallography, and the absolute configuration was revealed by experimental and computational optical rotation analyses. Cytotoxicities of 1-4 were measured in vitro against 10 selected cancer cell lines.
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Affiliation(s)
- Hai-Long Jiang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China
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Pereira AR, Kale AJ, Fenley AT, Byrum T, Debonsi HM, Gilson MK, Valeriote FA, Moore BS, Gerwick WH. The carmaphycins: new proteasome inhibitors exhibiting an α,β-epoxyketone warhead from a marine cyanobacterium. Chembiochem 2012; 13:810-7. [PMID: 22383253 PMCID: PMC3393770 DOI: 10.1002/cbic.201200007] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Indexed: 01/01/2023]
Abstract
Two new peptidic proteasome inhibitors were isolated as trace components from a Curaçao collection of the marine cyanobacterium Symploca sp. Carmaphycin A (1) and carmaphycin B (2) feature a leucine-derived α,β-epoxyketone warhead directly connected to either methionine sulfoxide or methionine sulfone. Their structures were elucidated on the basis of extensive NMR and MS analyses and confirmed by total synthesis, which in turn provided more material for further biological evaluations. Pure carmaphycins A and B were found to inhibit the β5 subunit (chymotrypsin-like activity) of the S. cerevisiae 20S proteasome in the low nanomolar range. Additionally, they exhibited strong cytotoxicity to lung and colon cancer cell lines, as well as exquisite antiproliferative effects in the NCI60 cell-line panel. These assay results as well as initial structural biology studies suggest a distinctive binding mode for these new inhibitors.
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Affiliation(s)
- Alban R. Pereira
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, 9500 Gilman Drive, La Jolla, CA 92093-0212 (USA), Fax: (+1)858-534-0576
| | - Andrew J. Kale
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, 9500 Gilman Drive, La Jolla, CA 92093-0212 (USA), Fax: (+1)858-534-0576
| | - Andrew T. Fenley
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0736 (USA)
| | - Tara Byrum
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, 9500 Gilman Drive, La Jolla, CA 92093-0212 (USA), Fax: (+1)858-534-0576
| | - Hosana M. Debonsi
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, 9500 Gilman Drive, La Jolla, CA 92093-0212 (USA), Fax: (+1)858-534-0576
- Departamento de Física e Química, Universidade de São Paulo, Ribeirão Preto, São Paulo 14040903 (Brazil)
| | - Michael K. Gilson
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0736 (USA)
| | - Frederick A. Valeriote
- Henry Ford Health System, Department of Internal Medicine, Josephine Ford Cancer Center, 440 Burroughs, Room 415, Detroit, MI 48202 (USA)
| | - Bradley S. Moore
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, 9500 Gilman Drive, La Jolla, CA 92093-0212 (USA), Fax: (+1)858-534-0576
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0736 (USA)
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, 9500 Gilman Drive, La Jolla, CA 92093-0212 (USA), Fax: (+1)858-534-0576
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0736 (USA)
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33
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Luo XH, Wang XZ, Jiang HL, Yang JL, Crews P, Valeriote FA, Wu QX. The biosynthetic products of Chinese insect medicine, Aspongopus chinensis. Fitoterapia 2012; 83:754-8. [PMID: 22430116 DOI: 10.1016/j.fitote.2012.03.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 02/26/2012] [Accepted: 03/05/2012] [Indexed: 11/30/2022]
Abstract
A new oxazole (1) was obtained from Chinese insect medicine Aspongopus chinensis, along with three known N-acetyldopamine derivatives (2-4). Their structures were determined on the basis of NMR and ESI-MS analyses. The possible biosynthetic pathways of the isolated compounds are discussed. Cytotoxicities of those compounds against 10 selected cancer cells were measured in vitro.
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Affiliation(s)
- Xiao-Hong Luo
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China
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34
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Valeriote FA, Tenney K, Media J, Pietraszkiewicz H, Edelstein M, Johnson TA, Amagata T, Crews P. Discovery and development of anticancer agents from marine sponges: perspectives based on a chemistry-experimental therapeutics collaborative program. J Exp Ther Oncol 2012; 10:119-134. [PMID: 23350352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A collaborative program was initiated in 1990 between the natural product chemistry laboratory of Dr. Phillip Crews at the University of California Santa Cruz and the experimental therapeutics laboratory of Dr. Fred Valeriote at the Henry Ford Hospital in Detroit. The program focused on the discovery and development of anticancer drugs from sponge extracts. A novel in vitro disk diffusion, solid tumor selective assay was used to examine 2,036 extracts from 683 individual sponges. The bioassay-directed fractionation discovery component led to the identification of active pure compounds from many of these sponges. In most cases, pure compound was prepared in sufficient quantities to both chemically identify the active compound(s) as well as pursue one or more of the biological development components. The latter included IC50, clonogenic survival-concentration exposure, maximum tolerated dose, pharmacokinetics and therapeutic assessment studies. Solid tumor selective compounds included fascaplysin and 10-bromofascaplysin (Fascaplysinopsis), neoamphimedine, 5-methoxyneoamphimedine and alpkinidine (Xestospongia), makaluvamine C and makaluvamine H (Zyzzya), psymberin (Psammocinia and Ircinia), and ethylplakortide Z and ethyldidehydroplakortide Z (Plakortis). These compounds or analogs thereof continue to have therapeutic potential.
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Affiliation(s)
- Frederick A Valeriote
- Josephine Ford Cancer Center, Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Health System, Detroit, MI 48202, USA.
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35
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Shaw J, Chen B, Bourgault JP, Jiang H, Kumar N, Mishra J, Valeriote FA, Media J, Bobbitt K, Pietraszkiewicz H, Edelstein M, Andreana PR. Synthesis and Biological Evaluation of Novel N-phenyl-5-carboxamidyl Isoxazoles as Potential Chemotherapeutic Agents for Colon Cancer. ACTA ACUST UNITED AC 2012; 4:14-25. [PMID: 25285182 DOI: 10.5099/aj120100014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A new series of isoxazole derivatives, N-phenyl-5-carboxamidyl isoxazoles, was investigated for their anticancer activity with solid tumor selectivity. Six N-phenyl-5-carboxamidylisoxazoles were chemically synthesized and evaluated by the in vitro disk-diffusion assay and IC50 cytotoxicity determination. The results showed that one of the derivatives, compound 3,N-(4-chlorophenyl)-5-carboxamidyl isoxazole, was the most active against colon 38 and CT-26 mouse colon tumor cells with an IC50 of 2.5 μg/mL for both cell lines. Western blot analysis showed that compound 3 significantly down-regulated the expression of phosphorylated STAT3 in both human and mouse colon cancer cells indicating that the mechanism of action for compound 3 may involve the inhibition of JAK3/STAT3 signaling pathways. Flow cytometric analysis with Annexin V staining showed that the death induced by compound 3 is mediated through cell necrosis and not apoptotic pathway. In summary, our results show that compound 3 is a new N-phenyl-5-carboxamidyl isoxazole with potential anticancer activity. Compound 3 inhibits the phosphorylation of STAT3, a novel target for chemotherapeutic drugs, and is worthy of further investigation as a potential chemotherapeutic agent for treating colon cancer.
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Affiliation(s)
- Jiajiu Shaw
- 21 Century Therapeutics, Inc., Ferndale, MI 48220, USA
| | - Ben Chen
- Department of Internal Medicine, Wayne State University, Detroit, Michigan 48201, USA
| | - Jean P Bourgault
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
| | - Hao Jiang
- Department of Neurology, Henry Ford Hospital, Detroit, Michigan 48202, USA
| | - Narendra Kumar
- Department of Pharmaceutical Sciences, ILR College of Pharmacy, Texas A&M University System Health Science Center, Kingsville, Texas 78363, USA
| | - Jayshree Mishra
- Department of Pharmaceutical Sciences, ILR College of Pharmacy, Texas A&M University System Health Science Center, Kingsville, Texas 78363, USA
| | | | - Joe Media
- Department of Internal Medicine, Henry Ford Hospital, Detroit, Michigan 48202, USA
| | - Kevin Bobbitt
- Department of Public Health Sciences, Henry Ford Hospital, Detroit, Michigan 48202, USA
| | | | - Matthew Edelstein
- Department of Internal Medicine, Henry Ford Hospital, Detroit, Michigan 48202, USA
| | - Peter R Andreana
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA
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36
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Ortet R, Prado S, Regalado EL, Valeriote FA, Media J, Mendiola J, Thomas OP. Furfuran lignans and a flavone from Artemisia gorgonum Webb and their in vitro activity against Plasmodium falciparum. J Ethnopharmacol 2011; 138:637-640. [PMID: 21982788 DOI: 10.1016/j.jep.2011.09.039] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2011] [Accepted: 09/21/2011] [Indexed: 05/31/2023]
Abstract
The chemical composition of the aerial parts of the Cape Verdean endemic shrub Artemisia gorgonum Webb (Asteraceae) was careful investigated, which led to the isolation and identification of six known furfuran lignans: eudesmin (1), magnolin (2), epimagnolin A (3), aschantin (4), kobusin (5), sesamin (6) and a flavone: artemetin (7). Compounds 1-7 were evaluated in vitro for their cytotoxicity in a screening panel consisting of various mammalian tumor cell lines, for their antimalarial activity against chloroquine-resistant Plasmodium falciparum (FcB1 strain) and for their cytotoxicity against murine normal cells (CFU-GM). While no promising cytotoxicity against human tumor cells were noticed, marginal potency and selectivity was found for compounds 1-5 against murine colon 38. Besides, compounds 2-7 showed mild antiplasmodial activities, 6 and 7 being the most active compounds (IC(50) 3.37 and 3.50 μg/ml respectively) without noticeable toxicity on mammalian normal cells. This is the first report of antiplasmodial activity for furfuran lignans and the first isolation of 1-7 from Artemisia gorgonum.
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Affiliation(s)
- Risoleta Ortet
- Université de Nice-Sophia Antipolis, Laboratoire de Chimie des Molécules Bioactives et des Arômes, UMR 6001 CNRS, Faculté des Sciences, 28 Avenue Valrose, 06108 Nice Cedex 2, France
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37
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Noguez JH, Diyabalanage TK, Miyata Y, Xie XS, Valeriote FA, Amsler CD, McClintock JB, Baker BJ. Palmerolide macrolides from the Antarctic tunicate Synoicum adareanum. Bioorg Med Chem 2011; 19:6608-14. [DOI: 10.1016/j.bmc.2011.06.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 05/05/2011] [Accepted: 06/02/2011] [Indexed: 11/30/2022]
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38
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Watts KR, Loveridge ST, Tenney K, Media J, Valeriote FA, Crews P. Utilizing DART mass spectrometry to pinpoint halogenated metabolites from a marine invertebrate-derived fungus. J Org Chem 2011; 76:6201-8. [PMID: 21682275 DOI: 10.1021/jo2009593] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Prenylated indole alkaloids are a diverse group of fungal secondary metabolites and represent an important biosynthetic class. In this study we have identified new halogenated prenyl-indole alkaloids from an invertebrate-derived Malbranchea graminicola strain. Using direct analysis in real time (DART) mass spectrometry, these compounds were initially detected from hyphae of the fungus grown on agar plates, without the need for any organic extraction. Subsequently, the metabolites were isolated from liquid culture in artificial seawater. The structures of two novel chlorinated metabolites, named (-)-spiromalbramide and (+)-isomalbrancheamide B, provide additional insights into the assembly of the malbrancheamide compound family. Remarkably, two new brominated analogues, (+)-malbrancheamide C and (+)-isomalbrancheamide C, were produced by enriching the growth medium with bromine salts.
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Affiliation(s)
- Katharine R Watts
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, USA
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39
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Gao S, Xu YM, Valeriote FA, Leslie Gunatilaka AA. Pierreiones A-D, solid tumor selective pyranoisoflavones and other cytotoxic constituents from Antheroporum pierrei. J Nat Prod 2011; 74:852-6. [PMID: 21452840 PMCID: PMC3371367 DOI: 10.1021/np100763p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Bioassay-guided fractionation of a solid tumor selective extract of the leaves and twigs of Antheroporum pierrei acquired from the U.S. National Cancer Institute extract repository afforded four new pyranoisoflavones, pierreiones A-D (1-4), together with rotenone (5), 12a-hydroxyrotenone (6), and tephrosin (7). The structures of all new compounds were determined on the basis of their spectroscopic data, and the absolute configuration of 1 was assigned with the help of (1)H NMR analysis of its Mosher's ester derivatives. Compounds 1 and 5-7 accounted for the majority of the biological activity in terms of either cytotoxicity and/or selective toxicity to solid tumor cell lines. Pierreiones A (1) and B (2) demonstrated solid tumor selectivity with minimal cytotoxicity, while pierreione C (3) exhibited no activity.
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Affiliation(s)
- Song Gao
- Southwest Center for Natural Products Research and Commercialization, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, The University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706-6800
| | - Ya-ming Xu
- Southwest Center for Natural Products Research and Commercialization, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, The University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706-6800
| | - Frederick A. Valeriote
- Division of Hematology & Oncology, Department of Internal Medicine, Henry Ford Hospital, Detroit, Michigan 48202
| | - A. A. Leslie Gunatilaka
- Southwest Center for Natural Products Research and Commercialization, School of Natural Resources and the Environment, College of Agriculture and Life Sciences, The University of Arizona, 250 E. Valencia Road, Tucson, Arizona 85706-6800
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Watts KR, Morinaka BI, Amagata T, Robinson SJ, Tenney K, Bray WM, Gassner NC, Lokey RS, Media J, Valeriote FA, Crews P. Biostructural features of additional jasplakinolide (jaspamide) analogues. J Nat Prod 2011; 74:341-51. [PMID: 21241058 PMCID: PMC3070360 DOI: 10.1021/np100721g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The cyclodepsipeptide jasplakinolide (1) (aka jaspamide), isolated previously from the marine sponge Jaspis splendens, is a unique cytotoxin and molecular probe that operates through stabilization of filamentous actin (F-actin). We have recently disclosed that two analogues of 1, jasplakinolides B (3) and E, were referred to the National Cancer Institute's (NCI) Biological Evaluation Committee, and the objective of this study was to reinvestigate a Fijian collection of J. splendens in an effort to find jasplakinolide congeners with similar biological properties. The current efforts have afforded six known jasplakinolide analogues (4-7, 9, 10), two structures requiring revision (8 and 14), and four new congeners of 1 (11-13, 15) including open-chain derivatives and structures with modified β-tyrosine residues. Compounds were evaluated for biological activity in the NCI's 60 cell line screen and in a microfilament disruption assay in both HCT-116 and HeLa cells. These two phenotypic screens provide evidence that each cytotoxic analogue, including jasplakinolide B (3), operates by modification of microfilaments. The new structure jasplakinolide V (13) has also been selected for study by the NCI's Biological Evaluation Committee. In addition, the results of a clonogenic dose-response study on jasplakinolide are presented.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Phillip Crews
- Corresponding author. Tel: 831-459-2603. Fax: 831-459-2935.
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Shaw J, Chen B, Huang WH, Lee AR, Media J, Valeriote FA. The small-molecule TNF-alpha modulator, UTL-5g, reduces side effects induced by cisplatin and enhances the therapeutic effect of cisplatin in vivo. J Exp Ther Oncol 2011; 9:129-137. [PMID: 21699020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigated a small-molecule modulator of tumor necrosis factor alpha (TNF-alpha), UTL-5g (also referred to as GBL-5g), as a potential chemoprotective agent against cisplatin-induced side effects including nephrotoxicity, hepatotoxicity and hematotoxicity. Pretreatment of UTL-5g i.p. in BDF1 mice reduced the levels of blood urea nitrogen (BUN) and creatinine induced by cisplatin treatment. The levels of both aspartate transaminase (AST) and alanine transaminase (ALT) in these animals were also reduced by UTL-5g. Pretreatment of UTL-5g did not significantly affect the number of white blood cells (WBC) under current experimental conditions, yet it markedly increased blood platelet counts by more than threefold. Therapeutic assessment in SCID mice inoculated with human HCT-15 tumor cells showed that UTL-5g did not attenuate the anti-tumor effect of cisplatin but increased the therapeutic efficacy of cisplatin. The LD50 of UTL-5g was determined to be > 2,000 mg/kg by an acute toxicity study. In summary, our studies showed that 1) UTL-5g significantly reduces nephrotoxicity and hepatotoxicity induced by cisplatin in mice, presumably by lowering the levels of TNF-alpha, 2) UTL-5g markedly increased blood platelet counts in mice and 3) UTL-5g treatment increased the therapeutic efficacy of cisplatin against HCT-15 cells inoculated in SCID mice.
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Affiliation(s)
- JiaJiu Shaw
- 21st Century Therapeutics, Inc., Shelby Township, MI 48316, USA.
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Wu QX, Crews MS, Draskovic M, Sohn J, Johnson TA, Tenney K, Valeriote FA, Yao XJ, Bjeldanes LF, Crews P. Azonazine, a novel dipeptide from a Hawaiian marine sediment-derived fungus, Aspergillus insulicola. Org Lett 2010; 12:4458-61. [PMID: 20866076 PMCID: PMC2953366 DOI: 10.1021/ol101396n] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Azonazine, a unique hexacyclic dipeptide, was isolated from a Hawaiian marine sediment-derived fungus eventually identified as Aspergillus insulicola. Its absolute configuration, 2R,10R,11S,19R, was established using NMR, HRESIMS, and CD data plus insights derived from molecular models. A possible route for its biogenesis is proposed, and biological properties were explored against cancer cell lines and in an NFκB inhibition assay.
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Affiliation(s)
- Quan-Xiang Wu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | - Mitchell S. Crews
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | - Marija Draskovic
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | - Johann Sohn
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, CA 94720
| | - Tyler A. Johnson
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, CA 94720
| | - Karen Tenney
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | | | - Xiao-Jun Yao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Leonard F. Bjeldanes
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, CA 94720
| | - Phillip Crews
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
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43
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Gross H, McPhail KL, Goeger DE, Valeriote FA, Gerwick WH. Two cytotoxic stereoisomers of malyngamide C, 8-epi-malyngamide C and 8-O-acetyl-8-epi-malyngamide C, from the marine cyanobacterium Lyngbya majuscula. Phytochemistry 2010; 71:1729-1735. [PMID: 20701935 PMCID: PMC2952490 DOI: 10.1016/j.phytochem.2010.07.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Revised: 06/09/2010] [Accepted: 07/01/2010] [Indexed: 05/27/2023]
Abstract
Two epimers of malyngamide C, 8-O-acetyl-8-epi-malyngamide C (1) and 8-epi-malyngamide C (3) have been isolated along with known compounds 6-O-acetylmalyngamide F (5), H (6), J (7) K (8), and characterized from a Grenada field collection of the marine cyanobacterium Lyngbya majuscula. The structures of these compounds were deduced by 1D and 2D NMR spectroscopic and mass spectral data interpretation. Absolute configurations were determined by a combination of CD-spectroscopy, chemical degradation and the variable temperature Mosher's method. Compounds 1-5, 7 and 8 displayed moderate cytotoxicity to NCI-H460 human lung tumor and neuro-2a cancer cell lines, with IC(50) values ranging between 0.5 and 20 microg/mL.
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Affiliation(s)
- Harald Gross
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, 53115 Bonn, Germany
| | - Kerry L. McPhail
- College of Pharmacy, Oregon State University, Corvallis, Oregon 97331
| | - Douglas E. Goeger
- College of Pharmacy, Oregon State University, Corvallis, Oregon 97331
| | | | - William H. Gerwick
- College of Pharmacy, Oregon State University, Corvallis, Oregon 97331
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California 92093-0212
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Calcul L, Inman WD, Morris AA, Tenney K, Ratnam J, McKerrow JH, Valeriote FA, Crews P. Additional insights on the bastadins: isolation of analogues from the sponge Ianthella cf. reticulata and exploration of the oxime configurations. J Nat Prod 2010; 73:365-72. [PMID: 20102170 PMCID: PMC4676785 DOI: 10.1021/np9005986] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The focus of this study is on the bastadin class of bromotyrosine derivatives, commonly isolated from Ianthella marine sponges, and is the first report on the secondary metabolites from Ianthella cf. reticulata. Two new bastadins were isolated, (E,Z)-bastadin 19 (1a), a diastereoisomer of the known (E,E)-bastadin 19 (1b), and dioxepine bastadin 3 (2), an unusual dibenzo-1,3-dioxepine. A bastadin NMR database was created and assisted in the structure determination of 1b and 2 and the rapid dereplication of 10 other known compounds including bastadins 2-9 (3-10), 13 (11), and 19 (1a). The geometry of the 2-(hydroxyimino)-N-alkylamide chains, a chemical feature present in all bastadins, was further probed, and new insights regarding the natural oxime configuration are discussed. Bastadins possessing (E,Z)-, (Z,E)-, or (E,E)-dioxime configurations could be artifacts of isolation or storage in solution. Therefore, this point was explored by photochemical and thermal isomerization studies, as well as molecular mechanics calculations. Bastadins 13 (11) and 19 (1a) exhibited moderate inhibition against Trypanosoma brucei, and bastadin 4 (5) was cytotoxic to HCT-116 colon cancer cells.
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Affiliation(s)
| | | | | | | | | | | | | | - Phillip Crews
- To whom correspondence should be addressed: Tel.: 831-459-2603. Fax: 831-459-2935.
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Shaw J, Valeriote FA, Media J, Johnson TA, Amagata T, Tenney K, Crews P. Development and validation of a rapid method for the detection of latrunculol A in plasma. Anal Bioanal Chem 2009; 396:1741-4. [PMID: 20043220 PMCID: PMC2825537 DOI: 10.1007/s00216-009-3385-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2009] [Revised: 11/30/2009] [Accepted: 12/04/2009] [Indexed: 12/03/2022]
Abstract
Latrunculol A is a recently discovered 6,7-dihydroxy analog of the potent actin inhibitor latrunculin A. Latrunculol A has exhibited greater cytotoxicity than latrunculin A against both murine and human colon tumor cell lines in vitro. Currently, there are no reports regarding the bioavailability of latrunculol A in vivo. This study was undertaken as a prelude to pharmacokinetic assessments and it is the first work where bioavailability of latrunculol A was studied. In the present work, a simple plasma preparation and a rapid HPLC method have been developed. Mouse plasma containing latrunculol A was first treated by acetonitrile and then centrifuged at 14,000 rpm at 4 °C for 25 min. The supernatant was injected in an HPLC system comprising a Waters Symmetry NH2 column, a mobile phase of acetonitrile/water (95/5, v/v), a flow rate of 1.0 mL/min, at 220 nm. The method was validated by parameters including a good linear correlation, a limit of quantification of 9 ng/mL, and a good precision with a coefficient variation of 1.65, 1.86, and 1.26% for 20, 400, and 800 ng/mL, respectively. With this simple method, excellent separation and sensitivity of latrunculol A are achieved, thus allowing a rapid analysis of the plasma samples for absorption, distribution, and metabolism studies.
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Affiliation(s)
- Jiajiu Shaw
- Henry Ford Health System, Detroit, MI 48202, USA.
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46
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Robinson SJ, Hoobler EK, Riener M, Loveridge ST, Tenney K, Valeriote FA, Holman TR, Crews P. Using enzyme assays to evaluate the structure and bioactivity of sponge-derived meroterpenes. J Nat Prod 2009; 72:1857-1863. [PMID: 19848434 PMCID: PMC2996101 DOI: 10.1021/np900465e] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Enzyme screening of crude sponge extracts prioritized a 2005 Papua New Guinea collection of Hyrtios sp. for further study. The MeOH extract contained puupehenone and four puupehenone analogues (1, 2, 3, 5, and 7) along with a new diastereomer, 20-epi-hydroxyhaterumadienone (4), and a new analogue, 15-oxo-puupehenoic acid (6). The drimane terpene core of 4 and 6 was rapidly dereplicated, and the modified Mosher's method identified 4, while 1D and 2D NMR techniques were used to solve 6. These compounds plus noteworthy repository natural products and standards were tested against three lipoxygenase isozymes, human 5-, 12-, and 15-lipoxygenases. Significant potency and selectivity profiles were exhibited in the human 5-lipoxygenase assay by puupehenone (1) and jaspaquinol (9) and structural factors responsible for activity identified.
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Affiliation(s)
- Sarah J. Robinson
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
| | - Eric K. Hoobler
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
| | - Michelle Riener
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
| | - Steven T. Loveridge
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
| | - Karen Tenney
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
| | | | - Theodore R. Holman
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
| | - Phillip Crews
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
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Simmons TL, Nogle LM, Media J, Valeriote FA, Mooberry SL, Gerwick WH. Desmethoxymajusculamide C, a cyanobacterial depsipeptide with potent cytotoxicity in both cyclic and ring-opened forms. J Nat Prod 2009; 72:1011-6. [PMID: 19489598 PMCID: PMC2857713 DOI: 10.1021/np9001674] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Cytotoxicity-guided fractionation of the organic extract from a Fijian Lyngbya majuscula led to the discovery of desmethoxymajusculamide C (DMMC) as the active metabolite. Spectroscopic analysis including 1D and 2D NMR, MS/MS, and chemical degradation and derivatization protocols were used to assign the planar structure and stereoconfiguration of this new cyclic depsipeptide. DMMC demonstrated potent and selective anti-solid tumor activity with an IC(50) = 20 nM against the HCT-116 human colon carcinoma cell line via disruption of cellular microfilament networks. A linear form of DMMC was generated by base hydrolysis, and the amino acid sequence was confirmed by mass spectrometry. Linearized DMMC was also evaluated in the biological assays and found to maintain potent actin depolymerization characteristics while displaying solid tumor selectivity equivalent to DMMC in the disk diffusion assay. A clonogenic assay assessing cytotoxicity to HCT-116 cells as a function of exposure duration showed that greater than 24 h of constant drug treatment was required to yield significant cell killing. Therapeutic studies with HCT-116 bearing SCID mice demonstrated efficacy at the highest dose used (%T/C = 60% at 0.62 mg/kg daily for 5 days).
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Affiliation(s)
- T. Luke Simmons
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037
| | - Lisa M Nogle
- College of Pharmacy, Oregon State University, Corvallis, Oregon 97331
| | - Joseph Media
- Josephine Ford Cancer Center, Henry Ford Hospital, Detroit, Michigan, 48202
| | | | - Susan L Mooberry
- Southwest Foundation for Biomedical Research, San Antonio, Texas 78245
| | - William H Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037
- Skaggs School of Pharmacy and Pharmaceutical Science, University of California San Diego, La Jolla, California 92037
- To whom correspondence should be addressed
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Amagata T, Johnson TA, Cichewicz RH, Tenney K, Mooberry SL, Media J, Edelstein M, Valeriote FA, Crews P. Interrogating the bioactive pharmacophore of the latrunculin chemotype by investigating the metabolites of two taxonomically unrelated sponges. J Med Chem 2009; 51:7234-42. [PMID: 18942825 DOI: 10.1021/jm8008585] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
This study involved a campaign to isolate and study additional latrunculin analogues from two taxonomically unrelated sponges, Cacospongia mycofijiensis and Negombata magnifica. A total of 13 latrunculin analogues were obtained by four different ways, reisolation (1-4), our repository (5, 6), new derivatives (7-12), and a synthetic analogue (7a). The structures of the new metabolites were elucidated on the basis of a combination of comprehensive 1D and 2D NMR analysis, application of DFT calculations, and the preparation of acetonide derivative 7a. The cytotoxicities against both murine and human cancer cell lines observed for 1, 2, 7, 7a, 8, 9, and 12 were significant, and the IC(50) range was 0.5-10 microM. Among the cytotoxic derivatives, compound 9 did not exhibit microfilament-disrupting activity at 5 microM. The implications of this observation and the value of further therapeutic study on key latrunculin derivatives are discussed.
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Affiliation(s)
- Taro Amagata
- Department of Chemistry and Biochemistry and Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, California 95064, USA
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Clark BR, Engene N, Teasdale ME, Rowley DC, Matainaho T, Valeriote FA, Gerwick WH. Natural products chemistry and taxonomy of the marine cyanobacterium Blennothrix cantharidosmum. J Nat Prod 2008; 71:1530-1537. [PMID: 18698821 PMCID: PMC2657878 DOI: 10.1021/np800088a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A Papua New Guinea field collection of the marine cyanobacterium Blennothrix cantharidosmum was investigated for its cytotoxic constituents. Bioassay-guided isolation defined the cytotoxic components as the known compounds lyngbyastatins 1 and 3. However, six new acyl proline derivatives, tumonoic acids D-I, plus the known tumonoic acid A were also isolated. Their planar structures were defined from NMR and MS data, while their stereostructures followed from a series of chiral chromatographies, degradation sequences, and synthetic approaches. The new compounds were tested in an array of assays, but showed only modest antimalarial and inhibition of quorum sensing activities. Nevertheless, these are the first natural products to be reported from this genus, and this inspired a detailed morphologic and 16S rDNA-based phylogenetic analysis of the producing organism.
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Affiliation(s)
- Benjamin R. Clark
- Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0212
| | - Niclas Engene
- Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0212
| | - Margaret E. Teasdale
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881
| | - David C. Rowley
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881
| | - Teatulohi Matainaho
- Discipline of Pharmacology, School of Medicine and Health Sciences, University of Papua New Guinea, National Capital District, Papua New Guinea
| | | | - William H. Gerwick
- Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0212
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0212
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50
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Johnson TA, Amagata T, Oliver AG, Tenney K, Valeriote FA, Crews P. The Unexpected Isolation of CTP-431, a Novel Thiopyrone from the Sponge Cacospongia mycofijiensis. J Org Chem 2008; 73:7255-9. [DOI: 10.1021/jo801096m] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tyler A. Johnson
- Department of Chemistry and Biochemistry and Department of Ocean Sciences, University of California, Santa Cruz, California 95064, and Josephine Ford Cancer Center, Henry Ford Health System, Detroit, Michigan 48202
| | - Taro Amagata
- Department of Chemistry and Biochemistry and Department of Ocean Sciences, University of California, Santa Cruz, California 95064, and Josephine Ford Cancer Center, Henry Ford Health System, Detroit, Michigan 48202
| | - Allen G. Oliver
- Department of Chemistry and Biochemistry and Department of Ocean Sciences, University of California, Santa Cruz, California 95064, and Josephine Ford Cancer Center, Henry Ford Health System, Detroit, Michigan 48202
| | - Karen Tenney
- Department of Chemistry and Biochemistry and Department of Ocean Sciences, University of California, Santa Cruz, California 95064, and Josephine Ford Cancer Center, Henry Ford Health System, Detroit, Michigan 48202
| | - Frederick A. Valeriote
- Department of Chemistry and Biochemistry and Department of Ocean Sciences, University of California, Santa Cruz, California 95064, and Josephine Ford Cancer Center, Henry Ford Health System, Detroit, Michigan 48202
| | - Phillip Crews
- Department of Chemistry and Biochemistry and Department of Ocean Sciences, University of California, Santa Cruz, California 95064, and Josephine Ford Cancer Center, Henry Ford Health System, Detroit, Michigan 48202
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